RestClient.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.zip.GZIPInputStream;


import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;

/*
 * This Class is coming from
 * http://lukencode.com/2010/04/27/calling-web-services-in-android-using-httpclient/
 * 
 * Modification : 
 *  - Added PUT and DELETE method on execute
 *  - Added GZIP
 *  
 * HOW to USE :
 * RestClient client = new RestClient(LOGIN_URL);
 * client.AddParam("accountType", "GOOGLE");
 * client.AddParam("source", "tboda-widgalytics-0.1");
 * client.AddParam("Email", _username);
 * client.AddParam("Passwd", _password);
 * client.AddParam("service", "analytics");
 * client.AddHeader("GData-Version", "2");
 * 
 * try {
 *     client.Execute(RequestMethod.POST);
 * } catch (Exception e) {
 *     e.printStackTrace();
 * }
 * 
 * String response = client.getResponse();
 */

public class RestClient {

	protected ArrayList<NameValuePair> params;
	protected ArrayList<NameValuePair> headers;

	protected String url;
	private String data = "";

	private int responseCode;
	private String message;

	private String response;

	private int timeoutConnection = 60000;
	private int timeoutSocket = 60000;

	public enum RequestMethod {
		GET, POST, PUT, DELETE
	}

	public String getResponse() {
		return response;
	}

	public String getErrorMessage() {
		return message;
	}

	public int getResponseCode() {
		return responseCode;
	}

	public RestClient(String url) {
		this.url = url;
		params = new ArrayList<NameValuePair>();
		headers = new ArrayList<NameValuePair>();
	}

	public void AddParam(String data) {
		this.data = data;
	}

	public void AddParam(String name, String value) {
		params.add(new BasicNameValuePair(name, value));
	}

	public void AddHeader(String name, String value) {
		headers.add(new BasicNameValuePair(name, value));
	}

	public void Execute(RequestMethod method) throws Exception {
		switch (method) {
		case GET: {
			// add parameters
			String combinedParams = "";
			if (!params.isEmpty()) {
				combinedParams += "?";
				for (NameValuePair p : params) {
					String paramString = p.getName() + "="
							+ URLEncoder.encode(p.getValue(), HTTP.UTF_8);
					if (combinedParams.length() > 1) {
						combinedParams += "&" + paramString;
					} else {
						combinedParams += paramString;
					}
				}
			}

			HttpGet request = new HttpGet(url + combinedParams);
			request.addHeader("Accept-Encoding", "gzip");

			// add headers
			for (NameValuePair h : headers) {
				request.addHeader(h.getName(), h.getValue());
			}

			executeRequest(request, url);
			break;
		}
		case POST: {
			HttpPost request = new HttpPost(url);
			request.addHeader("Accept-Encoding", "gzip");

			// add headers
			for (NameValuePair h : headers) {
				request.addHeader(h.getName(), h.getValue());
			}
			if (!data.equals("")) {
				request.setEntity(new StringEntity(data, HTTP.UTF_8));
			}

			if (!params.isEmpty()) {
				request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
			}

			executeRequest(request, url);
			break;
		}
		case PUT: {
			HttpPut request = new HttpPut(url);
			request.addHeader("Accept-Encoding", "gzip");

			// add headers
			for (NameValuePair h : headers) {
				request.addHeader(h.getName(), h.getValue());
			}
			if (!data.equals("")) {
				request.setEntity(new StringEntity(data, HTTP.UTF_8));
			}

			if (!params.isEmpty()) {
				request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
			}

			executeRequest(request, url);
			break;
		}
		case DELETE: {
			HttpDelete request = new HttpDelete(url);
			request.addHeader("Accept-Encoding", "gzip");

			// add headers
			for (NameValuePair h : headers) {
				request.addHeader(h.getName(), h.getValue());
			}

			executeRequest(request, url);
			break;
		}
		}
	}

	protected void executeRequest(HttpUriRequest request, String url) {

		HttpParams httpParameters = new BasicHttpParams();
		HttpConnectionParams.setConnectionTimeout(httpParameters,
				timeoutConnection);
		HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
		
		HttpProtocolParams.setUseExpectContinue(httpParameters, false);
		request.setParams(httpParameters);
		
		setOauth(request);
		
		DefaultHttpClient client = new DefaultHttpClient();

		HttpResponse httpResponse;

		try {
			httpResponse = client.execute(request);
			responseCode = httpResponse.getStatusLine().getStatusCode();
			message = httpResponse.getStatusLine().getReasonPhrase();

			HttpEntity entity = httpResponse.getEntity();

			if (entity != null) {
				InputStream instream = httpResponse.getEntity().getContent();
				Header contentEncoding = httpResponse
						.getFirstHeader("Content-Encoding");

				if (contentEncoding != null
						&& contentEncoding.getValue().equalsIgnoreCase("gzip")) {
					instream = new GZIPInputStream(instream);
				}

				// instream = entity.getContent();
				response = convertStreamToString(instream);

				// Closing the input stream will trigger connection release
				instream.close();
			}

		} catch (ClientProtocolException e) {
			client.getConnectionManager().shutdown();
			e.printStackTrace();
		} catch (IOException e) {
			client.getConnectionManager().shutdown();
			e.printStackTrace();
		}
	}

	private static String convertStreamToString(InputStream is) {

		BufferedReader reader = new BufferedReader(new InputStreamReader(is));
		StringBuilder sb = new StringBuilder();

		String line = null;
		try {
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}
	
	protected void setOauth(HttpUriRequest request) {
		
	}
}